Granted Patent
Utility
US 3,975,192 · App. 05/563,247
Dental alloy and amalgam
Inventor:
Harold H. Simpson
Patented Case
View Patent ↗
Granted: Aug 17, 1976
Filed: Mar 28, 1975
Inventor
Harold H. Simpson
Assignee (at issue)
Sybron Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.